Hash Generator (SHA-1, SHA-256, SHA-512)
Generate SHA-1, SHA-256, and SHA-512 hashes online. Free hash calculator using Web Crypto API.
How to use: Enter text, pick an algorithm (MD5, SHA-1, SHA-256, etc.), and copy the hash.
How to Generate Cryptographic Hashes
Enter your text and select an algorithm. The hash is generated instantly using the Web Crypto API built into your browser — no data is sent to any server. You can compare hashes to verify data integrity or use them for checksum validation.
Hash Algorithms Explained
SHA-256 is the industry standard for most applications including SSL certificates, blockchain, and password hashing. SHA-512 offers stronger collision resistance at the cost of a longer output. SHA-1 is deprecated for security use but still used for non-security checksums like Git commit hashes.
Frequently Asked Questions
- How do I generate a hash online?
- Enter your text in the input field and select the hash algorithm (SHA-1, SHA-256, or SHA-512). The hash is computed instantly in your browser using the Web Crypto API. Copy the result with one click.
- What is the difference between SHA-1, SHA-256, and SHA-512?
- They differ in output length and security. SHA-1 produces 160-bit hashes (considered weak for security). SHA-256 produces 256-bit hashes (standard for most applications). SHA-512 produces 512-bit hashes (highest security, slightly slower).
- Can you reverse a hash back to the original text?
- No. Cryptographic hash functions are one-way — you cannot reverse a hash to get the original input. This is by design and is what makes hashing useful for password storage and data integrity verification.